Need help acquiring Inferno recipe.

I am now working my way through Blood Grove and all that I receive in the few days of game time are all transcendent relic recipe which needs Inferno to craft.

Any place where I can have a better chance of getting Inferno?

I also searched Inferno recipe for a long time. I had a lot of second tier relics recipes drops until Inferno recipe drops from a random Treasure Trove. I was in Act 4 normal with lvl 50 or something when i finally get it.

Dont worry - it will drop - just hunt for Treasure Troves.